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Technical Specifications


7 1/2 R35

Diameter: 190.5mm (7 1/2")  
IADC Code: 543X  
Design number: UT65  
State standard designation: СЗ-ГВ  


Gradient angle of axle journal 35°
Axle journal offset relative to drill bit axis 3.30 mm
Bearing type Roller bearing
Sealing None
Total number of inserts (inner/heel row) 102 (63/39)
Total number of insert rows (inner/heel row) 11 (8/3)
Number of changeable nozzles 3
Connecting thread З-117 (4 1/2 REG)
Drill bit net weight, kg 37.00
Drill bit gross weight, kg 38.50

Recommended Drilling Conditions

Rotation speed 600-40 rpm
Thrust load 6.00-16.00 t (13200 - 35200 lbs)
The lower level of rotation speed value corresponds the upper level of thrust load value and vice versa.


The drill bit is designed for drilling medium hard abrasive formations

Design Features

Lateral flushing, through hydromonitor nozzles

The shirttail and leg entering edge are hardfaced with tungsten carbide

Tungsten carbide inserts on cone gages


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